高含水率淤泥的流动电渗透脱水实验研究
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摘要
为拓宽电渗透脱水实际应用范围,创新淤泥流动脱水技术,设计开发了流动淤泥电渗透脱水装置系统。研究了脱水时间、电压梯度以及离心泵功率对高含水率淤泥脱水速率及脱水能耗的影响并对装置的运行参数进行了优化。单因素实验结果表明:在3 h内,脱水速率、能耗系数基本保持稳定。在电压0~10.34 V·cm~(-1)的范围内,随着电压梯度的增大,淤泥电渗透脱水速率和能耗系数均相应增大。在水泵功率7~22 W的范围内,淤泥脱水速率与离心泵的功率呈正比关系,不同的是能耗系数随着水泵功率的增大而减小。响应面实验结果表明了在电压梯度0~10.34 V·cm-1,以及离心泵功率7~22 W的区间范围内,离心泵功率与电压梯度的交互作用并不明显,其中离心泵功率对脱水速率的影响更为显著。通过响应面实验得出在实验范围内装置的最优电压梯度和离心泵功率分别为10.34 V·cm-1和22 W,最优脱水速率为3 m L·min-1。
In order to broaden the practical application scope of electroosmosis dewatering and innovated sediment dewatering technology in the flowing state,electro-osmotic dewatering device was designed and developed to study the effect of high moisture-content sediment dewatering rate and energy consumption under different dehydration time,voltage gradient,and pump power in the state of flow,after that,the operation parameters of the device were optimized too. The results of single factor experiments showed that the dehydration rate and energy consumption coefficient were basically stable in 3 h. In the range of voltage 0 ~ 10. 34 V·cm~(-1),with the increase of voltage gradient,the electro-osmotic dehydration rate and energy consumption coefficient of sediment increase accordingly.In the range of pump power 7 ~ 22 W,the sediment dewatering rate is directly proportional to the centrifugal pump power. The difference is that the energy consumption coefficient decreases with the increase of the pump power.The response surface experimental results show that the interaction of centrifugal pump power and the voltage gradient is not obvious,the effect of pump power on the dehydration rate is more significant in voltage gradient 0 ~10. 34 V·cm-1 and 7 ~ 22 W centrifugal pump power range. Through the response surface experiment,the optimal voltage gradient and the power of centrifugal pump are 10. 34 V·cm-1 and 22 W respectively in the experimental range,The optimum dehydration rate is 3 m L·min-1.
In order to broaden the practical application scope of electroosmosis dewatering and innovated sediment dewatering technology in the flowing state,electro-osmotic dewatering device was designed and developed to study the effect of high moisture-content sediment dewatering rate and energy consumption under different dehydration time,voltage gradient,and pump power in the state of flow,after that,the operation parameters of the device were optimized too. The results of single factor experiments showed that the dehydration rate and energy consumption coefficient were basically stable in 3 h. In the range of voltage 0 ~ 10. 34 V·cm~(-1),with the increase of voltage gradient,the electro-osmotic dehydration rate and energy consumption coefficient of sediment increase accordingly.In the range of pump power 7 ~ 22 W,the sediment dewatering rate is directly proportional to the centrifugal pump power. The difference is that the energy consumption coefficient decreases with the increase of the pump power.The response surface experimental results show that the interaction of centrifugal pump power and the voltage gradient is not obvious,the effect of pump power on the dehydration rate is more significant in voltage gradient 0 ~10. 34 V·cm-1 and 7 ~ 22 W centrifugal pump power range. Through the response surface experiment,the optimal voltage gradient and the power of centrifugal pump are 10. 34 V·cm-1 and 22 W respectively in the experimental range,The optimum dehydration rate is 3 m L·min-1.
引文
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12 Bagotsky V S.Fundamentals of electrochemistry.2nd ed.Berlin:Springer,2005:3—36
2 罗清吉,石浚哲.五里湖淤泥现状及生态清淤.环境监测管理与技术,2003;(1):27—29Luo Qingji,Shi Junzhe.Present situation of five mile lake silt and ecological dredging.The Administration and Technique of Environmental Monitoring,2003;(1):27—29
3 王晓东,蒋建.淤泥处理技术研究综述.科技资讯,2009;(10):154—155Wang Xiaodong,Jiang Jian.Review of sludge treatment technology.Science&Technology Information,2009;(10):154—155
4 张春雷,管非凡,李磊,等.中国疏浚淤泥的处理处置及资源化利用进展.环境工程,2014;(12):95—99Zhang Chunlei,Guan Feifan,Li Lei,et al.Progress in reutillzation tretment and disposal of degraded sediments in China.Environmental Engineering,2014;(12):95—99
5 何品晶,顾国维,邵立明,等.水力吸泥-离心脱水疏浚过程的环境特征分析.同济大学学报(自然科学版),2002;(8):964 —968He Pingjing,Gu Guowei,Shao Liming,et al.Analysis of environmental characteristics of hydraulic suction and centrifugal dewatering dredging process.Journal of Tongji University(Natural Science).2002;(8):964—968
6 丁建文,张帅,洪振舜.高含水率疏浚淤泥流动固化处理试验研究.水运工程,2009;(6):30—34Ding Jianwen,Zhang Shuai,Hong Zhenshun.Experimental study on solidification in flowing state of dredged clay with high water content.Port&Waterway Engineering,2009;(6):30—34
7 Liao B Q,Allen D G,Droppo I G,et al.Surface properties of sludge and their role in bioflocculation and settleability.Water Research.2001;35(2):339—350
8 Lee J K,Shin H S,Park C J,et al.Performance evaluation of electrodewatering system for sewage sludges.Korean Journal of Chemical Engineering,2002;19(1):41—45
9 Mahmoud A,Olivier J,Vaxelaire J,et al.Electrical field:A historical review of its application and contributions in wastewater sludge dewatering.Water Research,2010;44(8):2381—2407
10 梁东正.泥浆电渗脱水的室内模型试验研究.郑州:郑州大学,2014Liang Dongzheng.Indoor model test study of electroosmotic dewatering mud.Zhengzhou:Zhengzhou University,2014
11 Yuan C,Weng C H.Sludge dewatering by electrokinetic technique:effect of processing time and potential gradient.Advances in Environmental Research,2003;7(3):727—732
12 Bagotsky V S.Fundamentals of electrochemistry.2nd ed.Berlin:Springer,2005:3—36